Nice spread, Spartan. A good cross section of what is available.

I was thinking of doing the same as you with the Nismo true dual, then decided on the INVIDIA GEMINI cat back. Bought it on Amazon for $876.97 to my front door. Sound is awesome and quality is really good. I cant give you any numbers but definitely a nice HP gain. Just my 2 cents.:tiphat:

That R-Tune is the AAM S Line rebranded. doesn't really count imo.

I just looked at the AAM line. The R-Tune I bought through Nissan's Nismo aftermarket company is very similar to AAM's S-Line system. There are some differences as well as similarities. There are enough differences that I don't agree with you that it is just rebranded. There are differences in the shape of the pipes. I also think the welding is better on the Nismo from what I can see from AAM's pictures and comparing to what I saw when mine were installed. I listened to their sound video. I really can't tell you how mine sounds outside the car, but I really enjoy the sound mine makes.

Definitely get the Nismo. It's the only OEM replacement that is 100% legal. Clean sound and good looks too.

Which Nismo ? There seem to be several to choose from.

The R-Tune